package com.wugui.datax.rpc.remoting.net.impl.netty_http.client;

import java.net.URI;
import java.net.URL;
import java.util.concurrent.TimeUnit;

import com.wugui.datax.rpc.remoting.invoker.XxlRpcInvokerFactory;
import com.wugui.datax.rpc.remoting.net.common.ConnectClient;
import com.wugui.datax.rpc.remoting.net.common.NettyConstant;
import com.wugui.datax.rpc.remoting.net.params.Beat;
import com.wugui.datax.rpc.remoting.net.params.XxlRpcRequest;
import com.wugui.datax.rpc.serialize.Serializer;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.timeout.IdleStateHandler;

/**
 * netty_http
 *
 * @author xuxueli 2015-11-24 22:25:15
 */
public class NettyHttpConnectClient extends ConnectClient {

	private EventLoopGroup group;
	private Channel channel;

	private Serializer serializer;
	private String address;
	private String host;
	private DefaultFullHttpRequest beatRequest;

	@Override
	public void init(String address, final Serializer serializer, final XxlRpcInvokerFactory xxlRpcInvokerFactory)
			throws Exception {
		final NettyHttpConnectClient thisClient = this;

		if (!address.toLowerCase().startsWith("http")) {
			address = "http://" + address; // IP:PORT, need parse to url
		}

		this.address = address;
		URL url = new URL(address);
		this.host = url.getHost();
		int port = url.getPort() > -1 ? url.getPort() : 80;

		this.group = new NioEventLoopGroup();
		Bootstrap bootstrap = new Bootstrap();
		bootstrap.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {
			@Override
			public void initChannel(SocketChannel channel) throws Exception {
				channel.pipeline().addLast(new IdleStateHandler(0, 0, Beat.BEAT_INTERVAL, TimeUnit.SECONDS)) // beat N,
																												// close
																												// if
																												// fail
						.addLast(new HttpClientCodec()).addLast(new HttpObjectAggregator(NettyConstant.MAX_LENGTH))
						.addLast(new NettyHttpClientHandler(xxlRpcInvokerFactory, serializer, thisClient));
			}
		}).option(ChannelOption.SO_KEEPALIVE, true).option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000);
		this.channel = bootstrap.connect(host, port).sync().channel();

		this.serializer = serializer;

		// valid
		if (!isValidate()) {
			close();
			return;
		}

		logger.debug(">>>>>>>>>>> xxl-rpc netty client proxy, connect to server success at host:{}, port:{}", host,
				port);
	}

	@Override
	public boolean isValidate() {
		if (this.channel != null) {
			return this.channel.isActive();
		}
		return false;
	}

	@Override
	public void close() {
		if (this.channel != null && this.channel.isActive()) {
			this.channel.close(); // if this.channel.isOpen()
		}
		if (this.group != null && !this.group.isShutdown()) {
			this.group.shutdownGracefully();
		}
		logger.debug(">>>>>>>>>>> xxl-rpc netty client close.");
	}

	@Override
	public void send(XxlRpcRequest xxlRpcRequest) throws Exception {
		byte[] requestBytes = serializer.serialize(xxlRpcRequest);

		DefaultFullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.POST,
				new URI(address).getRawPath(), Unpooled.wrappedBuffer(requestBytes));
		request.headers().set(HttpHeaderNames.HOST, host);
		request.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);
		request.headers().set(HttpHeaderNames.CONTENT_LENGTH, request.content().readableBytes());

		this.channel.writeAndFlush(request).sync();
	}

}
